I have the same problem (freeze on battery powered) in my new Dell Vostro 3700 
i7
I partially solved unchecking, in Power Management, the checkbox that reduce 
hdd speed when possible.
But now it freeze when battery level is critically low.
I think that this problem is all about Power Managent.
It really make maverick unusable on this laptop

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dell vostro 3700 always crash (frozen)  if I work with battery (power or 
thermal limit exceeded)
https://bugs.launchpad.net/bugs/656745
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